[PATCH v3 3/3] drm/msm/dpu: capture snapshot on the first commit_done timeout

[Dmitry Baryshkov]

In order to debug commit_done timeouts, capture the devcoredump state
when the first timeout occurs after the encoder has been enabled.

Signed-off-by: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c 
b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 30f349c8a1e5..3cae07bf0b9b 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -126,6 +126,8 @@ enum dpu_enc_rc_states {
  * @base:              drm_encoder base class for registration with DRM
  * @enc_spinlock:      Virtual-Encoder-Wide Spin Lock for IRQ purposes
  * @enabled:           True if the encoder is active, protected by enc_lock
+ * @commit_done_timedout: True if there has been a timeout on commit after
+ *                     enabling the encoder.
  * @num_phys_encs:     Actual number of physical encoders contained.
  * @phys_encs:         Container of physical encoders managed.
  * @cur_master:                Pointer to the current master in this mode. 
Optimization
@@ -172,6 +174,7 @@ struct dpu_encoder_virt {
        spinlock_t enc_spinlock;
 
        bool enabled;
+       bool commit_done_timedout;
 
        unsigned int num_phys_encs;
        struct dpu_encoder_phys *phys_encs[MAX_PHYS_ENCODERS_PER_VIRTUAL];
@@ -1226,6 +1229,8 @@ static void dpu_encoder_virt_atomic_enable(struct 
drm_encoder *drm_enc,
        else if (disp_info->intf_type == INTF_DSI)
                dpu_enc->wide_bus_en = 
msm_dsi_wide_bus_enabled(priv->dsi[index]);
 
+       dpu_enc->commit_done_timedout = false;
+
        mutex_lock(&dpu_enc->enc_lock);
        cur_mode = &dpu_enc->base.crtc->state->adjusted_mode;
 
@@ -2436,6 +2441,10 @@ int dpu_encoder_wait_for_commit_done(struct drm_encoder 
*drm_enc)
                        DPU_ATRACE_BEGIN("wait_for_commit_done");
                        ret = phys->ops.wait_for_commit_done(phys);
                        DPU_ATRACE_END("wait_for_commit_done");
+                       if (ret == -ETIMEDOUT && 
!dpu_enc->commit_done_timedout) {
+                               dpu_enc->commit_done_timedout = true;
+                               msm_disp_snapshot_state(drm_enc->dev);
+                       }
                        if (ret)
                                return ret;
                }

-- 
2.39.2